Dynamoelectric machine



ATTORNEY INVENTOR. C/arence FGi/christ BY I C. F. GILCHRIST DYNAMOELECTRIC MACHINE Filed March 4, 1920 6. F. GHLCHRIST DYNAMOELECTRIG MACHINE Filed Mann 4, 1920 2y Sheets-Sheet 2 INVENTOR. C/arence FGi/Chnbt A'TTORNEY Patented Dec. 23, 1924.

UNITED STATES,

PATENT OFFICE.

GLARENCEF; GILOHRIST, OF TOLEDO, OI-IIO. ASSIGNOR, ZBY MESNE ASSIGNMENTS, TO I THE ELECTRIC AUTO-LITE COMPANY, 065 TOLEDO, OHIO, A CORPORATION OF OHIO.

nnmiuonrncrmo MACHINE.

I Application filed March (,192'0. Serial No. 363,127.

To all'wkom it may concern:

Be it known that I, CLARENCE F. GIL- oHRIs'r, ,a citizen of the United States, re-

. siding at Toledo, in the county of Lucas and State of Ohio, have invented certain new and useful Improvements in Dynamoelectric Machines, of whichI declare the following to be a full, clear, and exact description.

This invention relates to dynamo-electric machines, particularly of the enclosed type,

such as are commonly employed as a part of the electrical equipment of motor vehicles, and it is an object of my invention to provide a structure which shall be better adapted to perform its intended functions yet be constructed of relatively few parts which may be accurately and quickly assembled thereby facilitating production in large quantities.

Further objects of this invention relate to economics of manufacture and details of construction as will hereinafter appear from the detailed description to follow. I acd complish the objects of my invention in one i instance by the devices and means described in the followingspecification, but it is evi dent that the same may be varied widely without departing from the scope of the ."invention as pointed out in the appended '30 claims. A structure constituting one embodiment of my invention, Which may be the preferred, is. illustrated in the accompanying drawings forming a part thereof, in which:

Figure I is a view of the commutator end of a generator involving my invention in partial vertical section. V

Fig. II is transverse sectional View taken on the line IIII\of Fig. I.

Fig. III is a transverse sectional view taken on the line IIIIII of Fig. I.

Fig.- IV is a top view of the generator shown in Fig. I with the end head detached and partially in section.

Figs. V and VI illustrate two modified forms of end head, the former adapted for use with a ball bearing and the latter adapted for use with a sleeve bearing.

Fig. VII is a sectional view taken on line 50 VII-VII of Fig'. I showing the binding 0st. v a

p Referring to the drawings, the commutator end of a generator 5 is shown in Fig. I

having a cylindrical frame 6 to which the pole pieces (not shown) are attached, and

within which the armature 7 is mounted.

The edge of the frame 6 is reduced in diameter at 8 and fitting over thisreduced portion is an and head 9 which serves to cover the commutator and also support the bearing for this end of ,the armature shaft. The and head 9 is secured to the frame by bolts (not shown on the drawing) which engage the frame 8. 'Suitable openings are provided in this end head'for giving access to the commutator and brushes, which openings are closed by a bandlO. The end head 9 which is preferably constructed as a steel stamping is provided with a circular central opening 12 opposite and within which a bracket 13 is clamped to the end head by a pair of screws engaging in the openings 14 in the bracket. as a support for the ball bearing 15 for the armature shaft and is provided with a vertical extension 16 for the purpose of sup porting an ignition timing and distributing evice, a portion of which'isshown at 19. This vertical extension has a split portion 17 and a clamping screw 'l8 by which the time ing and distributing device may be rigidly secured. The shaft of this device extends down into the bracket 13 and at its lower end is provided with a spiral gear 22 which meshes with a spiral gear 23 on the armature shaft. It will be noted that the bracket 13 not only supports the bearing for the armature shaft and the timing device, but also constitutes a housing for the aforementioned gears, protecting them from dust and preventing the loss of lubricating oil. An oil hole 24 is shown in this bracket member to facilitate the introduction of lubricant.

While the bracket 13 is secured to the end head by the aforementioned screws, accurate centering of this bracket is accomplished by roviding it with a flange26 which snugly Fits the central opening 12 in the end head and this flange also serves the additionalv purpose of centering or piloting the brush older ring; 27 This brush holder ring, which is perferably stamped u from sheet steel, is provided with a pair 0 diametrically opposite ears 28having elongated openings 29 through which extend securing bolts 30. By this means it is unnecessary to ac- This bracket- 13 serves bolts, since by means of the flange 26 and the cooperating flange portion 31 of the brush holder ring 27, this ring will always be maintained concentric with the shaft and therefore with the commutator. The slots 29in the ears 28 permit of necessary adjustment of the brushes and by means of the bolts 30 the-brush holder ring may be ermanently secured in adjusted position. gVhere no timingdevice is to be used, a bearing supporting cap such as shown at (see Fig. IV) may be employed secured by screws 36 or other suitable means to the outside of the end head and having a flange 37 corresponding to flange 26 fitting the openingjn the end head as in Fig. I. This flange, like that previously described, extends inwardly and serves as a guide or pilot for the brush holder ring 27.

In the modified form shown in" Fig. V, the end head 9 is' constructed with an integral bearing projection .40 which in this figure is shown, as supporting a ball hearing 41 for the armature shaft.

According to the modification shown in Fig. VI, the end head9' is provided with an integral extension as in-Fig. V in this case, a sleeve bearing is used.

In order to enable the use of the. same style end head for either a ball hearing or a sleeve bearing, the head .is constructed with a projection 40 large enough to accommodate a ball bearin and when a sleeve bearing is used, suitab e spacers are employed. These spacers are shown in Fig. VI as being a pair of rings. 43 preferably steel'stampmgs formed up channel shape.

in cross section. vA spacer of 7 minimum weight of material'and of ample strength is thereby provided. g,

- The binding post unit is secured to the frame 6 at its upper part, and has a shank I 71 with a head 72 and a pair of rectangular blocks of insulating material 73 and 74 mounted upon said shank. The block '73 is adapted to fit within a notch 75 cut into the edge of the frame 6 while the block 7 4 which "is wider than the notch overlies the frame 6 and by means of the nut 76, the frame. is clamped between the two blocks 7 3 and 74, Suitable connection .is madebetween this post and "one of the brushes by means of a flexible cable 78 having a terminal clip 79 secured under the head 72. After the assembled binding post has been slipped intd the notch 75 and made fast, the end head-9, which is provided with'a notch 80 of sufficient width and depth to receive the the shan block 74,"isslip ped in place and secured by the bolts to which reference has been made previousl A second nut 82 is screwed on 71. for the purpose of securing a wire or terminal for an external connection to the generator. It will be appreciated that, by means of theabove construction,

but,

the binding post may be completely assembled as a unit before being added to the generator, and during the assembly of the generator it may be applied as a unit and connected to the proper brush and that thereafter the end housing 9 may, be placed -in position with the notch 80 receiving the 2 binding post unit after which the parts ma be clamped in osition and secured. Thls, of course, resu ts in a considerable saving of time which would otherwise be consumed and it therefore results in an ins.

be understood that all matter. described.

abore or shown in the accompanying drawmg is to be interpreted as illustrative onl and not in a limiting sense.

aving thus described my invention,

what I claim us new anddesire to secure by Letters Patent, is: 4

1. In a dynamo-electric machine the com: bination with a frame having an end head Fwith a central opening therein and a brush supporting ring within said end head, of a bracket for supporting a. bearing for said machine and having a flange extending through said opening" and forming a guide for said brush supporting ring.

2. In a dynamo-electric machine having .an armature shaft," the combination of a frame having an end head witha central opening therein,'an adjustable ring ada ted to carry a plurality of brush holders, means for securing said ring to said head and a bracket mounted on the exterior of said end head for sup oftin a bearin for the shaft of said machine, said bracket aving aflange fitting the said opening and projecting into sai .head to form a pilot or said ring. T

, 3. In a dynamo-electric machine, the combination with an armature shaft and a frame T having an end head, said head being provided with a central opening in the end thereof, a bracket mounted on said end ead having a flange fitting said opening to position the bracket on the head, a bearing. for said shaft carried by said bracket, said bracket being constructed to engage and su port a timer having a shaft geared to sai arma-f be secured to an en of said machine and to carry a shaft bearlng for said machine'and another portion for supporting a shaft at right angles to the first mentioned shaft, an

- intermediate portion of. said bracket being constructed to form a housing for gear' mechanism connecting said two shafts.

,5. In a dynamo-electric machine, a frame, an end head engaging said frame, the adjacent edges of said frame and end head being clamping said binding post said notches enabling the binding post unit to be previously assembled and inserted in tgenotches during the assembly of the mac me. I

fpost engaging in said notches .able in said notch as a 7. In a dynamo-electric machine, a frame, an end head therefor, said frame and end head having overlapping portions,-said portions being provided with aligning notches' extending inward from the edges thereof,

and a binding post unitcomprising a pair of insulating sleeves having shoulders to engage said frame and means for clampingsaid sleeveto'said frame, said binding post unit adapted to be inserted in assembled condition in said notches durin the assembly of said frame andend hea d.

K 8. In a dynamoelectric machine, a frame, an end head en g said frame, the adjacent edge of 881d frame havinga notch, a binding post for said machine having means for clamping said fm'me the arrangement being such that the bindmg post is insertunit'and the end head closes the notch,

In testimony whereof, I afiix my signature.

- CLARENCE F. GILCHRIST. 

